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Porting might lower the velocity compared to what that gun did before it was ported but still the velocity is going to vary more from gun to gun. My 8 3/8" M27 only shoots about 30-50fps faster than my 4" GP100. And that's using 2400 or H110 (slow powders) which should give an advantage to the long barrel.
You'd think that more than 4" of barrel would account for more, but each gun is a law unto itself.
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